Valve-cock



MTD STATES PATENT OFFICE.

JOHN GRIFFITHS, OF PHILADELPHIA, PENNSYLVANIA.

'VALVE-COCK.

Specification of Letters Patent No. 10,516,1dated February 14, 1854.-.

To all whom t may concern.'

Be it known that I, JOHN GRIFFITHS, of the city and county of Philadelphia and State of Pennsylvania, have invented a new and useful .Improvement in Valve- Cocks; and I dol hereby declare that the following is a full, clear, and exact description of the construction and operatio-n of the same, reference being had to the accom* panying drawing, forming part oi' this specification, in which- Figure l, is a side view of a stop cock, constructed according to my invention. Fig. 2, is a longitudinal section of the same, through the center.

Similar letters of reference indicate corresponding parts, in both figures.

structed, it is practically very imperfect.v

It is usual to make the screw by which the valve is opened and closed, on the valve stem; and unless every part is very truly constructed, this will cause one side of the valve to close or bear in its seat harder than the other parts, which will be liable to bend the stem. with worse consequences, when the valve has a broad bearing, as it is not so easily closed all around; and hence, it has been customary to make it with a narrowseat. The object of my invention is to Vconstruct the cock in lsuch a way that the valve will always close truly, and thus allow it to be made with a bearing of such width as will enable it to be kept as tight as the best plugv cock.

The nature of my invention consists 1n making the valve with a cylindrical stemV passing` through a hollow stem which is attached rigidly to, or forms part of, the body of the cock, and is furnished outside with the nut.

The above diiliculty is attended and use my invention, I will proceed to describe its construction and operation.

A, is the body of the cock, and, B, is theV opened and closed; itis tted to the screw,

a, on the hollow fixed stem, and is provided with a wheel or lever by which it is turned; it is furnished above with a yoke, g, which fits easily to the valve stem above the collar, f, being confined to the stem by a nut, 71 iitting to the screw, e; this nut fits down to a shoulder, so that it does not bite the yoke, but simply prevents a longitudinal motion, of the valve stem and nut, independently of each other, not preventing the turning oi The valve is raised and lowered by the turning of the nut. g

The valve stem issquared at the top to receive a wrench for grinding the valve. To grind the valve, the nut hy, should be taken ott'. The valve of a cock of large size, constructed in this way, may be ground in a few minutes; whereas a three-inch plug will commonly take five o-r six, and sometimesten, hours, to grind in tight, whenever it leaks.

In cocks of large size, the body, A', mayV substantially in the manner and'for the purpose herein described.

JOHN GRIFFITHS. Witnesses:

vHENRY SIMPSON, vWILLIAM Ross. 

